Valve.



PATENTED JULY 19, 1904.

E. SCHMIDT.

VALVE.

APPLICATION FILED 001'. no, 1903.

H0 MODEL.

a w m To all whom it may concern:

of the United States, residing at Davenport, in the county of Scott andState of Iowa, have invented new and useful Improvements in Valves, ofwhich the following is a specification.

valves of air and gas pumps; and its object is to produce a valveWlliClIWlll not pound or ram, whereby a noiseless and easy-acting valveis produced.

ing the minimum of wear on the seat and disk.

valve and its seat that a gas or air cushion is' produced between thevalve and its plate by forming a recess under the rim having a small ornarrow outlet, whereby when the valve seats the air or gas contained inthe recess will have a retarded escape, thereby forming a cushion forthe valve.

trated in the accompanying drawings, in whichchest, showing the valvesin plan; and Fig. 2 1s a central longitudinal section.

cylinder is indicated at 6, the valve-chest at 7, and the cylinder-heador valve-plate at 8. The latter is let into a rabbet 9 in the end of thecylinder and is lapped at its outer edges and held in place by thevalve-chest, which is bolted to flanges 'on the end of the cylinder. Thevalve-chest has a central partition 7, which reaches to thecylinder-head and forms inlet and outlet chambers in which the inlet andoutlet valves, respectively,\vork. The inlet-valve comprises a disk 10,the stem 11 of which works through a guide-bore in a bridge 12, which isbolted to the cylinder-head and spans the valve-opening. The valve isnormally closed by a spring 13, coiled around the stem and held incompression between the bridge and nuts, and a Washer on the end of thestem. The disk has the usual inclined or beveled edge fitting acorresponding seat in the cylinder-head and has also at the back thereofan extended rim 14, which laps the UNIT D STATES Patented July 19, 1904PATENT OFFICE.

JOHN A. RUSSEL, OF

DAVENPORT, IOlVA.

VALVE.

SPECIFICATION forming part of Letters Patent No. 765,200, dated July 19,1904.

Application filed October 20, 1903.

Be it known that-I, EMIL SCHMIDT, a citizen This invention relatesparticularly to the A further object is to produce a valve hav- Theseobjects are effected by so forming the An embodiment of the invention isillus- Figure 1 is a cross-section through the valve- Referringspecifically to the drawings, the

Serial No. 177,727. (No model.)

edge of the plate around the valve-opening and fits within a recess orrabbet produced therein, as indicated at 20. The opposite or inner facesof the rim and rabbet are preferably curved, as shown, forming at theouter edge of the rim an annular rib 14: and groove lfh Thecorresponding face of the rabbet has a similar groove and rib. A narrowslit or space 1 1 is left between the extreme edge of the diskand theedge of the plate at the rabbet for the slow escape of the gas when thevalve seats. The outlet-valve is in the main similarly formed. Itconsists of a disk 15,fitting an appropriate seat in the cylinderhead,and this disk has an overlapping rim 16, the inner face of which has arib 16 and groove 16 corresponding to an opposite rib and groove aroundthe valve-seat and producing therebetween a recess 20, having similarfunction to the recess 20 of the inlet-valve. A narrow space 16 is alsoproduced for the escape of the gas forming the cushion. The disk has astem 17, which works through a tube 18, supported by a bridge over thevalve, and the bore of the tube is fitted by an enlarged diameter 17 ofthe valve-stem,whereby the movement of the valve is guided. A spring 19,in compression between the shoulder produced by the larger diameter ofthe valve-stem and the head of the tube, normally of the gas throughsaid opening. This cushions the valve and forms a noiseless closurewithout the pounding or jar incident to ordinary valves. Wear does notaffect the action, but, if anything, improves it, because as the linesof the ribs and grooves approach each other a contracted opening isformed not only at the points 14 and 16, but also at the line where therib changes into or joins the groove, producing a double contractedopening.

Necessarily the gas underneath the extended rim of the valve must beforced out, and the pressure on the outer side being greater the natureof the cushion formed will be dependent upon the relative size of therecess and the escape-opening, the proportions of which may be varied atwill. The cushion will protect the seat and disk from wear, and theconstruction has obvious advantages of simplicity and utility. It mayalso be remarked that the two diameters 17 and 17 of the stem ofthe'outlet-ivalve working in different bores in the tube produce adouble guide, which makes the seating of the valve perfect. hat I claimas new, and desire to secure by Letters Patent, is

The combination with a valve-seat having around outside the same aninner rib and outer groove, of a solid disk valve which fits against theseat and has a laterally-extending rim at the back edge thereof, saidrim having on its under side an inner groove and an outer rib,corresponding to and fitting over the rib and groove around the seat,without contact there with, the space between being contracted at theouter edges of the grooves, forming a cushion independent of thevalve-seat.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

EMIL SCHMIDT. Witnesses:

F. D. Ln'rrs, S. L. WVADsWoRTH.

